Preparing paper and other fabrics and materials for wrapping silver and other metals



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PREPARING APER AND oTHER TO PR VENT THEM srscrrrca rron forming .part ofLetters 2mm; 1:... 223,814, dated January 27, 1880.

x 'xarrnn'smsro 3 PATENT O FICE.

Application filed October 31, 1879.

To all, whom it may concern Be it known that I, JOHN G. PENNINGTON, 'acitizen of the United States, city of Paterson, in the county of Passaicand State of New Jersey, have invented certain new and usefulImprovements in Preparing Paper and other Fabrics andMaterialsforWrappin g Silver and other Metals to Prevent them fromTarnishing;

and I do hereby declarethat the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains toma'ke and To carry out this invention, Imake a solution of oxide of zinc or oxide of lead in caustic soda,caustic potash,or'caustic ammonia, and impregnate the paper, cloth, orother fabric and material with it by any convenient means,

y when it may be dried, and is then fit for use.

For example, I take, say, sixty pounds of solid caustic soda anddissolve it in enough boilingwater to make a solution of 20 Baum. I thenadd forty pounds of oxide of zinc and boil the mixture for two hours,preferably under a pressure of sixty pounds per inch. When the solutionis clear it may be diluted to 10 Bauni, and.- the paper or other fabricor materials impregnated with it.

The object of this invention is to impregnate paper or other fabric ormaterials with sub stances which will combine with and neutrah ize anys'ulphureted hydrogen, sulphurous acid, or otheracid gases or vaporsthat may be present in the atmosphere, so as to prevent them fromtarnishing silver or other metals that may be wrapped up in the paper-orother fabric.

I am aware that a patent has been granted to Samuel 0. Eaton, No.213,100, dated March 11, 1879, in which is described a process forimpregnating paper and other fabrics witha solution of chloride ofammonium, chloride of potassium, chloride of 'zinc, and hypochlorite oflime, or'bleaching-powder; but hypochlorite of lime, or.bleaching-powder, would tarnish silver or other metal very quickly.Chloride of potassium and ammonium, are neutral salts, and cannotneutralize sulphureted hydrogen or other acids, and chloride of zinc isobjectionable because, if itshould combine with sulphureted-hydrogen orother acid gas, it would set free hydrochloric acid, which would tarnishthe silver wrapped in such paper.

FABRICS AND MATERIALS FOR-WRAPPING SltVER AND OTtlliR' METALS .FROMTARNISHING.

The process above described is free from 7 this objection. The whole ofthe zinc or lead present is'available to combine with and neu-- tralizethe sulphureted hydrogen in the at-. mosphere without setting free anyacid, and the'soda is also free .to neutralize any acid gases or vaporsthat may be vpresent, and to prevent themfrom acting on the silver or,other metal that may be wrapped in paper or other fabric so prepared.

Having thus described .my invention, I

claim as new and desire to secure by Letters Patent of the UnitedStates- 1.- The method above described for preparing paper or otherfabric to render the same suitable for protecting metals againsttarnishing, which consists iii impregnating the fabric with a solutionof oxide of zinc or lead in caustic soda, caustic potassa, or causticammonia.

. 2. As anew article of manufacture, paper R or other fabric.impreguated with the chemi cals above described, for the purpose setforth.

In testimony that I claim the foregoing'aa two witnesses.

JOHN C. PENNINGTON;

Witnesses:

JOHN R. BEANE,

my own? I affix my signature in presence of WILLIAM PENNINGTON.

